Intake Manifold Runner Control Stuck Closed (Bank 1)
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Rough idle or surging at idle
- Lack of throttle response at low to mid RPM range
Most Likely Root Causes
- Carbon buildup causing intake manifold runner to stick closed
- Failed intake manifold runner control valve or actuator
- Broken or disconnected vacuum hoses to runner control actuator
- Faulty intake manifold runner position sensor
- Damaged or seized intake manifold runner flaps or linkage
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Component Location
The intake manifold runner control valve and actuator are located on or inside the intake manifold assembly.
Manufacturer Notes
Some manufacturers recommend periodic intake manifold cleaning to prevent carbon-related runner control failures on high-mileage engines.
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